Locals took to social media to report feeling a “sharp jolt” from the quake, with many of them in the La Habra area of Orange County.
The United States Geological Survey (USGS) said the quake, which had a depth of 4.8 miles, hit at 8:21am local time (4:21pm UK time).
Twitter user Michael Kim wrote: “Another earthquake just hit Southern California. It was a sharp jolt.”
The news comes amid heightened fears of California being rocked by a manitude 7.0 earthquake or greater, known as the ‘Big One’.